Add enable_d2d_links() for Xe2/Arrow Lake platforms where the display
connection requires D2D (die-to-die) link setup before connector
detection. Programs DDI_BUF_CTL with D2D_LINK_ENABLE (bit 29) and
polls D2D_LINK_STATE (bit 28) for each port.
Called from IntelDriver::new() when generation == GenXe2, before
power well initialization.
Linux reference: intel_ddi.c (XE2LPD_DDI_BUF_D2D_LINK_ENABLE)
Compiled: 0 new errors
vasilito
5dd1178d83